Heterogeneous Data Synchronization. Mobile Database And The Database Of Main Memory

In this thesis, we first depicted the source of mobile computing environment, elucidated some core concepts of data synchronization, and abstracted the broad definition of data synchronization. Aimed at the two nodus: the mapping of heterogeneous data; and the realization of conflict disposed mechanism, we introduced basic conceptions; general technology, study out a method to realize the synchronization of data in those heterogeneous database based on mobile computing environment.The thesis analysed achievement and disadvantage that nowadays many main data accessible technologies had upon the two nodus. Drew a conclusion that in computing environment, the data synchronization of heterogeneous database couldn't be realized without support of specially advanced data synchronization protocol.So, the paper introduced the SyncML protocol which applied for the purpose of synchronizing each mobile device and network data. It solved the problem that mapping of heterogeneous data by synchronized engine technology, the application of XML and agent technology. It also realized conflict detected mechanism. But regretfully, it provided little policy to another nodus: conflict resolved mechanism. So we strengthened the synchronized engine's support to open database interface, improved it by two-floor conflict disposed mechanism. Based on these method, we conceived the frame of data synchronization of heterogeneous database found on mobile computing environment.Considered usual condition in mobile computing enviorenment, the thesis put forward a creative thought--"more mobility on client, high capability on server", combined that mobile database has a small capacity, connected and disconnected frequently; memory database has short latency time, fast data accessibility; therefore, according to SyncML protocol; based on the frame of data synchronization of heterogeneous database, built a model of rapid synchronization of heterogeneous data, using mobile database technology on client and customized memory database technology on server. Through experiments, it has been proved to be a improvement of data synchronization technology, and has been applied to the Mobile Dispatch system of the China Airdrome.